Real-time collaboration: Remove post list lock icon and replace user-specific lock text when RTC is enabled.

When RTC is enabled, the post list should not show an exclusive lock icon or user-specific lock text since multiple users can collaboratively edit the same post.

Merges a fix from Gutenberg: https://github.com/WordPress/gutenberg/pull/76322.

Developed in: https://github.com/WordPress/wordpress-develop/pull/11234.

See #64622.
Props maxschmeling, czarate, mcsf, shekharnwagh.



git-svn-id: https://develop.svn.wordpress.org/trunk@62074 602fd350-edb4-49c9-b593-d223f7449a82